Apparatus for heading nails or tacks.



PATENTED MAR. 17, 19-03,.

I A. H. BRIGHAM. APPARATUS FOB. HEADING NAILS 0R TAGKS.

APPLICATION FILED AUG. 25, 1902.

N0 MODEL.

Art

UNITED STATES PATENT Prion.

ALBERT H. BRIGHAM, OF WHITMAN, MASSACHUSETTS.

APPARATUS FOR HEADING NAILS OR TACKS.

SPECIFICATION forming part of Letters Patent No. 722,669, dated March 17, 1903.

Application filed August 25, 1902. Serial No. 120,877. (No model.) 7

To all whom it may concern.-

Be it known that I, ALBERT H. BRIGHAM, a citizen of the United States, residing at Whitman, county of Plymouth, State of Massachusetts, have invented an Improvement in Apparatus for Heading Nails or Tacks, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

In United States Patent No. 658,203,granted to me September 18, 1900, I have shown an apparatus for heading nails or tacks wherein the die provided with a head-forming opening is supported and guided in a die-carrier in such manner that a highly-effective apparatus is secured and adaptable to a wide range of work. My present invention relates to apparatus of like character; and it has for its object the-production of novel means for holding and guiding the die in the die-carmen The various novel features of my invention in its present embodiment will be hereinafter described, and particularly pointed out in the following claims.

Figure 1 isalongitudinal sectional view of a portion of a nail or tack making machine with one form of my invention embodied therein; Fig. 2 is a similar view, but showing the die in position to effect the heading of the nail or tack, the die-carrier being broken off; Fig. 3 is a front elevation of the die-carrier, die, and guide-plate therefor. tion of the die proper, and Fig. 5 is a view similar to Fig. l of the die-carrier detached and a modified form of die.

The cooperating dies 0. b, Figs. 1 and 2, to receive and grip between them the blank (1 and having suitable seats or depressions a. b, Fig. 1, to shape and form the under side of the head (1' of the blank, are of usual construction.

The heading-diev comprises a shank or die carrier 0, having a central longitudinal bore 0 enlarged and screw-threaded at its rear end at c, Fig. 1, and counterbored at its front end, as at a, substantially as in my patent referred to, the bore receiving the headingpin 0 which is longitudinally adjusted by a threaded rod 0 screwed into the threaded end of the bore, the said rod 0 also taking Fig. 4 is a side elevaup end thrust of the heading-pin. In my present invention I have chambered the front end of the die-carrier at e concentric with the counterbore c, andthis'chamber is closed by a guide-plate g, rigidly secured to the diecarrier by screws 5 and havinga circular aperture g opposite the end of the holder 0 This holder for the heading-pin c is shown as a removable tubular bushing, preferably split longitudinally at 0 (see Figs. 1 and 5,) seated in the counterbore c and projecting into the chamber 0 the inner end of the holder resting firmly upon the shoulder 3, substantially as in my patent. The die proper is shown herein as a plug f, usually of hardened steel and preferably cylindrical in crosssection and fitted to freely slide longitudinally in the aperture g of the plateg, the die having at its inner end an annular retainingflangef A coiled spring 8X, shown as surrounding the projecting end of the holder 0 is interposed between the bottom of the chamber e and the inner end of the die, and, as shown in Fig. 1, the spring normally holds the die projected through the guide-plate,the flange f limiting such movement of the die.

The die is provided with a head-forming opening f, shown as a central hole of sufficient diameter to receive the end of the heading-pin 0 which projects beyond the end of the holder 0 and enters the hole in the die. One or more set-screws 5, extended into the die-carrier c, bear upon the holder a to clamp it upon the heading-pin, as in Fig. 3. I prefer to slightly round off or convex the outer end of the die peripherally, as at f so that its central portion shall firmly bear upon the dies. or, and 1) during the heading operation.

In the present instance of my invention the upper part of the head (1 of the nail or tack is cylindrical and forms the base of a cone, and the heading-pin is so adjusted that when the heading is efiected the cylindrical part of the head will be formed in the headforming opening of the die,the outer end of the heading-pin determining the thickness of such cylindrical part of the head of the nail or tack, while the conical'par't of the head is formed by the dies 0. and b. The distance between the inner end of the die f and the adjacent end of the holder c may, if desired, be such that when the heading-pin closes the head-forming opening, as described, the die will bottom upon and be supported by the holder. This is not necessary, however, as the spring 5 which projects the die, can readily be made strong enough to give any necessary support to the die during the heading operation.

In Fig. 1 the dies at and b are holding the blank, and the end thereof which is to be upset to form the head will enter the headforming opening f when the heading-die is moved forward into the position shown in Fig. 1, the die f being stopped by engagement with the dies at and b. The shank or die-carrierc then continuesits forward movement and the spring s is compressed, the advancing heading-pin a engaging the end of the blank, upsetting it into the head-forming opening and the shaping or forming recesses a, b in the dies (1 and b, the upsetting being completed when the die f is pushed into the die-carrier into the position shown in Fig. 2. After forming the head on the blank the die-carrier c is withdrawn with the heading-pin, the spring 3 maintaining the dief againstthe dies a and 1) until the retainingflange f engages the guide-plate g. The latter is of sufficient thickness to accurately and positively guide the die and maintain it properly centered, as the guide plate is rigidly connected with the die-carrier. The chamber 0 provides space for the spring and for the retaining-flange of the die in its movements. By varying the longitudinal adjustment of the heading-pin to regulate the effective depth of the head-forming opening in the die, a greater or less amount of metal may be upset, according to the size and shape of the head to be formed upon the blank. A check-screw c is shown in Fig. 1 inserted in the threaded portion (2 of the bore of the die-carrier and engaging the end of the rod c to securely lock the latter in position when adjusted.

A modified form of die is shown in Fig. 5, the die It being therein shown as having a recess 72 in its inner end, coaxial with the hole h, which receives the heading-pin, said recess being of a diameter to easily receive the projecting end of the holder 0 when the spring .9 is compressed. In this construction the holder serves to assist in guiding the die in its longitudinal movement during the heading operation, the apparatus in other respects being the same as hereinbefore described, the die having a retaining-flange 72. on its inner end.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is j 1. In a heading-die, a die-carrier chambered at one end and having a central, longitudinal bore, a tubular holder Within the chamber and coaxial with the bore, a guide-plate rigidly secured to the chambered end of the die-carrier and having a die-receiving aperture, a yieldingly-supported die longitudinally movable in said aperture, and guided by the plate, and having a head-forming opening, a heading-pin extended through the holder into the die, and means to secure the heading-pin in the die-carrier.

2. In a heading-die,a die-carrier chambered at one end and having a central, longitudinal bore, a tubular holder Within the chamber and coaxial with the bore, a guide-plate rigidly secured to the chambered end of the die-carrier and having an aperture opposite the holder, a die longitudinally movable in said aperture, and having a retaining-flange at its in nor end, said die having a head-forming opening, a heading-pin extended through the holder into the die, and means to secure the heading-pin in position.

3. In a heading-die,a die-carrier chambered at one end and having a central, longitudinal bore, a tubular holder within the chamber and coaxial with the bore, a guide-plate rigidly secured to the chambered end of the die-carrier and having a die-receiving aperture, a die longitudinally movable in said aperture, and having a retaining-flange at its inner end, said die having a head-forming opening, a spring interposed between the bottom of the chamber and the die, to project the latter, a heading-pin extended through the holder into the die, and means to secure the heading-pin in the die-carrier.

4.. In a heading-die, a die-carrier having a central longitudinal bore, a removable tubular holder seated in the carrier and coaxial with the bore, a guide-plate rigidly secured to the end of the die-carrier beyond the holder and having an aperture oppositethe end of the latter, a spring-controlled die longitudi-- nally movable in said aperture and having a retaining-flange at its inner end, said die having a head-forming opening, a heading-pin inserted in the holder and extended into the die, and means to retain the heading-pin in said holder, the die when in operation being supported and guided by the guide-plate.

5. In a heading-die,a die-carrier chambered at one end and having a central, longitudinal bore, counterbored at the end adjacent the chamber, a removable, tubular holder seated in the counterbore and projecting into the chamber, a guide-plate closing the chamber and rigidly secured to the die-carrier and having an aperture opposite the holder, a die longitudinally movable in the aperture of and guided by said plate, said die having a headforming opening, and a retaining-flange at its inner end, a controlling-spring surrounding the holder and interposed between the bottom of the chamber and the inner end of the die, a heading-pin extended through the holder into the die, and means to secure the heading-pin in said holder and die-carrier, the die when in operation compressing the spring.

6. In a heading-die,a die-carrier chambered at one end and having a central, longitudinal bore, a removable, tubular holder, seated in the front end of the bore and projecting into the chamber, a centrally-apertured guideplate closing the chamber and rigidly secured to the die-carrier, a spring-controlled die 1ongitudinally movable in the guide-plate and having a head-forming opening, and a retaining-flange at its inner end, a heading-pin extended through the holder into the die, and means to retain the heading-pin in fixed position.

7. Inaheading-die,adie-carrier chambered at one end and having a central, longitudinal bore, a tubular holder seated in the adjacent end of and coaxial with the bore and projecting into the chamber, a guide-plate closing the chamber and having an aperture opposite the holder, a spring-controlled die lon- ALBERT H. BRIGHAM.

Witnesses:

WALTER E. TRUFANT, G. HOWARD SOULE. 

